Cement-kiln



J,v NELSON;

` y CEMENT KxLN.,

APPLICATION FlL ED MAR. 24, 1920.

'- Famed Jan; 25,1921.

2 SHEETS-SHEET l.

' Application tiled March M,

To ,whom it may. concern.' Be 1t known that I, J oHX NELSON, a citizen'fof the United States of America, resid- I and inexpensive of vto provide a kiln having a ing at Ottawal in the county of Franklin and State oflansas, have invented'certain v new and useful Improvements in Cement- Kilns, of which the following is a specilica- The 'prima vob'ect of the invention is the provision of a downdraft kilnadapted for calcining the pulverized lcement ingredients for the manufacture of Portland cement, the device being simple in construction, and easy installation.

l.A further object of the invention is the provision of a. cement kiln adapted for conserving the heat employed in its operation.

the cost of producing ce- 'rest or baille the heat waves at the bottom ofy the kilnpreventing the loss of the pulverized articles of cement.

A stil further object of the invention is downdraft maintained'by upward passage of the products of combustion surrounding the kiln chamber, ready ignition means being arranged as well usan a' 'tated feed for the ingredients gto be calcne view taken upon line With these general objects yin view the invention consists of the novel combination and arrangement of parts hereinafter more fully described in connection with the accompanyin drawings, and in which like vreference c aracters designate corresponding parts throughout the several views.

n. lthe drawings, .Figure 1 is a. central vertical sectional view'taken through the device, Fig. 2 is a top plan view of one-half therewith .the feed member removed, 3 is a transverse sectional view taken' upon line' III-III of Fig. 1, l

Fig. 4 is a transverse sectional view .taken upon line IV--IV of Fig. 1.

Fig. 5 lis an enlarged horizontal sectional V--V- of Fig. 1, and 6 is a transverse sectional view g vi-vi of through the stack upon line Fig. 1.

y. eferring more in detail to the drawings, a kiln having inner brick or similar material with an updrau'ght 'ace 12 therebetween, while a steel shell or casing 13 surrounds the outer wall 11. The

Specication of Letters Patent.

'communicates with each v'descending through said JOHN NELSON, 0F OTTAWA, KANSAS.

CEMENT-KEN.

Patented Jan. 25, 1921.

i920. serial 110.368.300.

)ulverized Portland cement ingredients to e calcined or burned' in the kiln are received through a stack or conveyer discharge-pipe 1-1 in the circular portion 15 of the cap plate or spider 16, upon the top of the furnace, the conveyer or feeding means for such ingredients being, preferably such as that illustrated in in v pending application Serial Xo. 312,022, filed Julyv 19, 1919,

for a method of making Portland cement and calcining kiln therefor, and shown here- 1n, but it being noted that any suitable convever mechanism may be employed.

two-part downdraft burner 1T 1s placed at the top of the kiln beneath the cap ring 15, with downwardly-projecting nipples 18 leading in'to the vertical central chamber 19 of the kiln. The spider 1G rests upon the top of the walls ally projecting from the ring 15. the ends of the legs being secured to the shell 113 by rivet members 32. A mixing pipe 20 for combustible mixture such as gas and air section or half of the burner 1T, controlled b v a valve 21 in each gas supply pipe 2T. The lighting of the burner-1T is initiallyv effected b v suitable spark plugs 22 carried adjacent the nipples 18 of the twosections of the burner 1T and connected by suitable electric wiring 23 for operation at a distance in a manner that will be readilv apparent.

The cement ingredients or other conipound enters the chamber 19 through the feed pipe l-l and is acted upon by the intense heat from the burner 1T. The inner wall 10 is mounted upon a ring having 10 and 11 with legs 31 radisupporting legs 25 ltlierebtv leaving a space at the bottom of the inner wall 10 for the heat and products of combustion to pass into the lower end of the up-draftspace 12.

A helical baille plate or wall 26 is provided in the space 12, wherebythe products of combustion from the kiln are carried circuitously and spirally around the inner wall 10, and within the outer wall from the bottom to the top of the are exhaustedthiough the open top of the space 12. The heat is conserved in this manner, all of the same being utilized in the downdraft calcining chamber 19 so that the entire ingredients entering the top of the kiln are calcined by the iiaine and heat chamber 19. This calcined material'drops upon crushing rollers 28 beneath the bottom of the chamber' 19 kiln where the sameA and is discharged in powdered form upon an endless belt conreyer 29 beneath said rolls for conveying to any distant point desired. The flame enters the bottom of the space 12 a suitable-distance above the base or wall 30 of the kiln and continuously rises gradually varound within the said space 12; thereby An endless belt conveyer 19 having buckets l 20 may elevate and dump the ingredients substantially centrally into the top of the' kiln so that such elevating and depositing of the powdered ingredients in the upright kiln heated to a white heat by the burner undersuitable control further constitutes my method of manufacturing Portland cement.

The upgoing portion of the conveyer 19 passes through a tubular member or conduit 32 enlarging into the stack 11 whereby the filled buckets are successively dumped into the stack for feeding to the kiln, the empty buckets 20 descending through an opening 33 in the side ofthelstack 11. rihe ingredients for making the Portland cement are pulverized before being taken up bytl'ie conveyer 19 such operation being accomplished in any manner such as by grindingI in the Grulin mill: I

A screen or sieve 31 within the lower inner end of the stack 11 receives the`pulverizcd ingredients which are agitated thereon so as to pass evenly therethrough in a descending shower or mist. o f the .ingredient particles.

Aninverted cone 35 is adjustably mounted in the stack 11 by means of arms 36 upon the cone positioned through vertical slots 3'( in the stack 11. said arms 36 and cone 35 being retained in their adjusted position by lock nuts 38 threaded upon the arms 36 ef;- teriorly of the stack 11. The electric motor` 38 is secured within the cone 35 and protected thereby is a suitably shaped fan or blade 39 upon its power shaft 10 positioned adjacent the upper side of the screen 31 for evenlydistributing the pulverized material upon the screen and imparting sutlicient agitation thereto for evenly sifting the ingredients through the screen 31 for descent through fthe chamber 19. Electrical circuit wiresetl for the motor 38 may follow one of y the arms 36 throughthe adjacent slot 3T of the stack 11 to any convenient point for turning on and off the'motor as well regulating the speed o f the agitator 39.

The mixing pipes ortubes 20, vertically recesso i le, positioned at the opposite sides of the kiln communicate with the respective sections of the burner 1T,y the valves :2l simultaneously controlling the supply of gas from the pipes :2T to the tubes 20 and atmospheric air through the damper plate 1:2. A platehavend of the shaft 15 is adapted for conven`v Y ience in grasping by the fingers for turning the shaft 1.3 to shift the wings 13 and regulate the admission of air through the openings 11 simultaneously withV the regulating of the ilow of gas through the pipe QT to the tube 20.

1n this manner. the sections of the burner 17 are supplied with combustible mixture readily ignited by either one or both of the spark plugs :22. the cement ingredients from the conveyer 19 passing through the screen 31 freely descend through the burner 1T to the calcining chamber 19 without any interruptitin during the operation ofthe kiln.- The flue 11 has a flange 19 at its lower end o\erlyiiig`th'e:spidernl and mounted upon the inner avall, lt'lofthe kiln. which taken with the I:connection between the tops ot' the walls 10 and 11 bythe spider' arms 31 secured to the jacket l-alfords a strong and serviceable construction.

Vlfith this construction no nue dampers are requiredhand the base of the kiln is sulliclently tight to prevent the escape of prodillustrated areemployed. it being understood that the baffle wall Qlretards the sudden updraft of the products of combustion preventing any fine calcined material from being wasted by exhausting therewith.

An eflicient downdraftkiln is provided with the spiral baffle :26 servingV the function of a half-closed damper and all. the draft and heatV being driven in a retarding channel spirally and continuously a number of times around withinthe space 12. between the walls. a kiln of simple construction and etlicient in its operation. is'tlie result. 1t will. be understood that while the form of the inventionnerein set forth is .believed preferable. minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

What 1 claim as new and desire to secure by Letters Patent. is :lj l l. A kiln comprising spaced annular walls having a downdraft chamber therein communicating with the space between the walls adjacent the bottom of the kiln and a baille municating with the space between the walls adjacentfthe bottom of the kiln, a baille plate spirally` connected between said walls forming an updraft iue outletting adjacent the top of the kiln.' a burner in the top of the kiln adapted for projecting flame downwardly therein and controlling and lighting means for the burner operable at a dist-ance therefrom.

3. A kiln comprising an annular wall, mounting legs beneath said .-.w'alL-an outer wall spaced lfrom the rst-nalned'wiall forming an outlet passage for the products of combustion, a burner at the top centrally of the kiln and a spiral batlie plate between said walls whereby the products of combustion are led in a helical path upwardly from the bottom to the top of the kiln.

4. A kiln comprising an annular wall, Y

mounting legs beneath said wall, an outer wall spaced from the rst-named wall forming an outlet passage for the products of combustion, a burner at the top centrally of thelkiln, a spiral bale plate between said vwalls whereby the products oflcombustion are ledv in a helical path upwar y from the bottom to the top of the kiln with an outlet for the products of combustion adjacent the top lof the kiln.

5. A cement kiln comprising spaced inner and outer Walls -with the inner wall terminating above the bottom of the kiln, a downwardly-projecting burner at. the top of the Linner wall, the inner wall having a downdra-t chamber therein communicating with an updraft chamber between said walls and a spiral baille between the walls whereby the products of Vcombustion are led in a spiral path of travel from the bottom to the top of the kiln between'the said walls.

6. A kiln comprising outer and inner walls with an updraft space therebetween, a baiiie plate spirally arranged within 'said space within the outlowing path of travel of the products of combustion from the kiln, a screen member for ingredients entering the kiln having portionsspanning the tops of said walls and means for supplying ingredients 4to the screen. l

7. A kiln comprisin outer and inner walls with a flue passage ,therebetween and a downdraft chamber ithin the inner wall, the line passage being ppen at the top of the kiln, a. batiespirally arranged in said passage rom the bottom tio the top of the kiln, a metal jacket surrounding said outer wall, a screen for the incoming ingredients positioned above said chamber and arms proj ecting outwardly Jfrom the screen, upon the tops of said walls with the outer ends of the arms secured to said jacket.

8. VA kiln comprising outer and inner walls with a flue passage therebetween and a downdraft chamber within the innerwall, the flue passage being open at the top of the kiln, a baille spirally arranged in said passage from the bottom to the top of the kiln, a metal jacket surrounding said outer Wall, a screen for the incoming ingredient-s positioned above said chamber, arms projecting outwardly from the screen, upon the tops of said walls with the outer ends of the arms secured to said jacket, burner sect'ons adjacent the top of the inner Wall beneath said screen. means for supplying combustible mixture to said sections and air and gas controlling means for said supply means.

In testimony whereof I aiiix' m signature.

JOHN i ELSON. 

